The letter he received in the post read: "Thank you so much for popping in the other day. We certainly appreciate your business and hope your beginning to get excited about your upcoming first class flight to the Maldives!"

It included an itinerary for a trip to the Maldives in early December, flying first class with Etihad Airways.

"Please keep in mind, balance in due on Friday, November 10th at 12:05 p.m.," the letter went on.

However, the letter was all part of a prank by his local Flight Centre travel agent, who had found his driving licence outside their shop — and found a unique way of returning it.

"We're just kidding. We’ve found you're driving license [sic] (enclosed) outside our shop and thought you might need it!" the letter read, adding: "Just make sure you consider us for your next holiday."

Armstrong visited the store to thank Steve, the man who found his licence and returned it to him with the cruel-but-funny prank.

He posted a photo to Twitter alongside Steve, saying: "here's the man himself, thank you Steve!"

A Flight Centre spokesperson told MailOnline Travel: "We’re delighted that the dedicated Flight Centre team in Cheltenham were able to reunite William with his lost driving licence and we hope he’ll visit the store again soon."